While you're thinking about food prices, here's one more from The Big Picture to worry about. I questioned the source of the data - not because I think the projections are wrong (or right for that matter), but because I would like to know how credible the data is.
I do think resource use is an economic problem, with an economic answer. But as several of the people leaving comments to the post inferred, much of the concern may actually be about use vs. availability.
As always, I look forward to your thoughts.